Revised cascaded cooling method for natural gas liquefaction

摘要

(57) Abstract This invention liquefying the compressed gases style of methane rich making use of the heat exchanger which was cooled by the refrigeration system of cascade type, regards the method in order to produce the methane rich liquid product (20) which possesses the temperature above temperature of approximately -112C (-170F). Regarding this method, the gases style (10) which were pressurized in order heat exchange to contact the 1st refrigerating cycle (32) which at least possesses one freezing stage (30-31) being introduced, the gases style are cooled by the 1st part of the 1st refrigerant, the gases style which were cooled are produced. This the gases style which were cooled after that at least possess one freezing stage (37-39) in order 2nd refrigerating cycle (33) and heat exchange to contact being introduced, the description above cool the gases style which were cooled, temperature and the liquefaction product of approximately -112C (-170F) are designated as below bubble pointing produce the flow (19) of methane rich the pressure which is sufficient is liquefied.